美国采购需求：氧气发生器、氧疗、便携式氧气浓缩器、呼吸系统

I'm interested in the portable oxygen concentrator you're offering. Could you please provide the price per unit along with the minimum order quantity? Additionally, I'd like to know the warranty details for the product. Also, it would be helpful to understand the process for submitting a warranty request in case any issues arise. Looking forward to your response!